The Cron Job/Crontab
To have your task run at this frequency, use the following cron:
0 0 13 */3 *
This cron command translates to the following (in Human-Readable format):
“Every 3 months on day 13 of the month.”
What is a Cron Job & Crontab?
A cron job is a time-based task that is set to run at specific intervals. This can be anything from running a script every hour to backing up a database every day. Cron jobs are typically used for maintenance tasks or tasks that need to be performed regularly, such as checking for updates or sending out reports.
To create or edit a cron job, users must first open the crontab file using a text editor. The crontab file contains instructions for the cron daemon, which is the program that actually executes the commands specified in the file. Each line in the crontab file represents a single task or command.
Every cron job uses five fields. Here is an explanation of what each field does in this cron, which runs “every 3 months on day 13 of the month“:
FUN FACT: Cron is one of the most versatile tools in a Linux administrator’s toolbox..
You might want to set up a crontab or cron job to run every 3 months on day 13 of the month for several reasons, including:
- Checking for updates to a software package
- Generating reports
- Cleaning up temporary files
- Archiving old log files
Similar Cron Jobs
You might also want to run a crontab:
- every 5 months
- every 2 months
- every 4 months
- every 3 months
- every 4 months on day 20 of the month
- every 6 months on day 15 of the month
FUN FACT: A common use for cron jobs is to generate periodic reports – for example, you could set up a cron job to automatically generate and send out a report on website traffic statistics every week..
In this article, you learned how to set up a cron job that runs every 3 months on day 13 of the month. Please share this page with friends and colleagues if you find it useful.
If you have any questions, please don’t hesitate to comment below.
If you are looking for cron jobs that run at certain minutes, hours, days, weekdays, or months, or if you are looking for miscellaneous cron jobs, then check out our relevant sections, or visit our crontab cheat sheet for a list of hundreds of popular cron jobs.